OO-1049 grand admin/moderator rights also to co authors for open meeting course elements (patch from Stephan Clemenz)

OO-984: add media mapper for description, objectives, credits, requirements, refactor long to int conversion in quota, remove some used parameters for the rich text element

no-jira: backport fix for the escaping of already escaped characters by TinyMCE in enrollment course element

OO-1038: better check of long without exception, try and catch in PersistingCourseGroupManager, unit tests

-no-jira: replace escaping with antisamy for group description as the description is edited with TinyMCE (which already escape special characters)

OO-716: replace the flot library in the course statistics with the bar chart component which use d3.js

OO-981: move administration module of catalog to the repository module, update the "administration" features...

OO-985: implements the view to retrieve the course and associated data of a user, filter and order by, clean up the code